Nut lock



N. A. PALMGREN.

NUT LOCK.

APPLICATION HLED'DEC. I, 1921.

1,420,737, PatentedJu ne27, 1922.

anventoz A414. Palmyra. $331 War/cm s P J Q M 'UNITED I STATES PATENT: oFE cE.

NILS ARVID PALMGREN, or GOTTENBORG, SWEDEN, 'ASSIGNOIB, 'ro

. f .AKTIEBOLAGET SVENSKA KULLAGERFABRIKEN, A CORPORATION OF SWEDEN.

NUT Locx.

in This invention relates to an improved nut locking device and hasfor an ob ectto provide a strong and efficient construction and one wherein the relative locking positions between the nut and the bolt reside but short 16 angular distances apart.

In the drawing accompanying this specification a practicable embodiment of the in-- vention is shown by way of illustration in which drawings- Figure 1 is an axial section of a nut and bolt provided with my improvement, the locking member being shown in crosssection.

.Fig. 2 is a plan view of the mechanism re resented in Fig. 1, and 'g. 3 is a detail of a modification for increasing the number of locking positions.

In describing my invention I will first have reference to the simpler form illustrated herein. In Figs. 1 and 2, 5 represents 80 the screw threaded end of a bolt having at its outer portion a transverse slot 6 for receiving the locking member presently to be described. Screwed into place upon the bolt is a nut 7 of modified castellated form hav- 86 ing a plurality of elevations 8 set off by channels or transverse notches 9. The sides of the elevations define the not ches and ipresent engaging faces for the .locking ngers 10 and 11 of the locking member 12,

the body portion of which is shown located in the .slot 6 mentioned above. The locking "member is held in position in some convenient manner, as, for instance, by a suitable number of screws 13, which are preferably prevented from displacement by means of lock washers, 14. I

The number of. notches in the outer face of the nut is dependent in a degree on the size of the nut and upon the character of to material of which itand the bolt are made as well as upon the object upon which it is contemplated using it. The greater the rigidity of all these elements named, the

- smaller is the possible amount of angular u movement upon the bolt.' In the present Specification of Elietters Patent; Patented J 119 Applieatieu filed December 1, .1921. Serial m. 519,057.

at Gottenborg, in the Kingdom of 5 Swe en, have invented certain new and use-.

b the centerline of this locking member.

will give the number of possible positions atillustration the count of the slotsjor notches is an odd number and also a prime number, such a number being selected. for a definite purpose which will be explained later.. In the present illustration eleven notches are shown. The locking finger 10 is shown oifset from the body portion of the member by wlnch it is-carried; the line a represents the center line of the bodyportion and the line The angle between these two lines is oneelghth of the angular distance between two ad acent slotsin the nut. If the nut hap-' pens to be screwed down to its illustrated position, 'the locking member may be dropped into the slot- 6 and into that notch" 9 which it isv now shown. as occupying. S hould, however, the nut be turned down still further this locking-finger will then find lodgment in the same notch by turning the body portion upside down, that is, the

face a; which is now lowermost will be placed up and the other face y inthe position now. occupied by the face This 1 brings the finger 10' further toward the right. If, however, neither of .these 'positions brings a slot-into register with these two positions'of the locking finger, the looking member is tried at 'a position of angular advance of 180 and both the faces a: and y presented at the top. This givesfour com;

binations, and unless the position in which the nut has to be located must be very accurately defined it is generally possible to force the nut the small amount necessary to permit thelock-ingfinger, in one of its four possible positions, to register in one-or the other ofthese notches. The number of locking positions corresponding to the turning angle equal to the angle between two-adjacent notches may be increased from four to' eight by adding a second slot 6 in the end of the bolt as illustrated in Fig. 3. The number of permissible positions for the looking finger in respect of the. position of the '100 I bolt multiplied by the number of notches, assuming this number to be an odd number and prime to the number offslots in the bolt,

which the-nut may be locked during a complete rotation. In the Figure 1 construction this is forty four. In the Fig.3 construction it is eighty eight.

For additlonal sec urit it is sometimes desirable to have a ed finger at each 110.

end of the body portion of the locking member. It will be seen that the lockin fin er 11 is offset unsymmetrically to the 0 setting of the finger 10. The center line 0 of this finger 11 is shown at a greater angle from the center line a of the body portlon, than is the center line b of the finger 10, 1n the present illustration three times. The difference in these angles is controlled by the number of the notches 9 in the nut. By suitably selectin these angles when the finger 10 is locate in any slot, the finger 11 will be located in aslot at the other side of the nut.

In some instances a slight amount of movement of the nut is unobjectionable, it being more important that the locking device find lodgment rapidly. To accommo date such conditions,- one of the side faces of the notches may be disposed angularly to the other, giving the locking bolt a certain amount of clearance in each notch, thereb making all positions locking positions.

learance afforded by this expedient is shown in Fig. 3, and indicated by the reference character 15. v

Certain changes In the detalls of construction may, of course, be made within the scope of the claims without departing from the spirit of my invention.

I claim as my invention:

1. In a nut lock, the combination with a threaded bolt having at its end a trans verse slot, of a castellated nut, and a looking member comprising a body portion adapted to seat in the slot in .the bolt and a finger adapted to seat in the notches-of the nut, the finger Ofthe locking member being dlsposed at an angle to the body por tion thereof, whereby, uponreversal of the position of the said body in the slot the finger assumes differentangular-positions.

, ber comprisin 2. In a nut lock, the combination with a threaded bolt having at its end a transverse slot, of a castellated nut having an odd number of notches, and a locking memseat in the s ot in the bolt and a finger adapted to seat in the notches of thenut, the finger of the locking member being disposed at an angle to the body portion thereof different from the angular distance between centers of the notches, the position of the said body portion in the slot being capable of a-reversal.

a body portion adapted to 3. In a nut lock, thecombination with a threaded bolt having at its end a plurality of transverse slots, of a castellated nut, the number of its notches being indivisible by the number ofslots in the bolt, and-a looking member comprisin adapted to seat in the 5 0t inthe bolt and a finger adapted to seat in the-notches of the nut, the finger of the locking member being disposed at an angle to the body portion thereof, the position of the said body portion in the said slot being capable of reversal end for end and face for face.

4. In a nut lock, the combination with a threaded bolt having at its end a plurality of transverse slots, of a nut having a number of notches prime to the number of the said slots, and a locking member comprising a body portion adapted for seating in the slot in thebolt and a pair of difi'erently offset fingers adapted to seat in the notches of the nut.

5. In a nut lock, the combination with a threaded bolt having at its end a plurality of transverse slots, of a nuthaving a number of notches prime to the number of the said slots, and a locking member comprising a body portion adapted for seating in the slot in the bolt and a pair of differently offset fingers adapted to seat in the notches of the nut one of the side faces of each notch being disposed angularly to the other, whereby the nut may have a limited movement in relation to the finger.

6. Ina nut lock, the combination with a threaded bolt having at its end a transverse slot, of a castellated nut, the number of its notches being a prime number, and a lock-.

ing member comprisin a body portion adapted to seat in the s ot in the bolt and a finger adapted to seat in the notches of the nut, the finger of the locking member being disposed at an angle to the body portion thereof different from the angular distances between centers of the notches, where- 'by upon reversal end for end or face for a body portion face of the position of the said body in the slot the finger assumes different angular positions requiring different positions of the nut for permitting the finger to sink into a notch thereof.

In testimony whereof, I have aflii'zed my signature hereto.

NILS ARVID PALMGREN] 

